| 8 |
#include <dlfcn.h> |
#include <dlfcn.h> |
| 9 |
/* assert */ |
/* assert */ |
| 10 |
#include <assert.h> |
#include <assert.h> |
| 11 |
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/* strcat */ |
| 12 |
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#include <string.h> |
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|
| 14 |
#define HASHTBLSIZE 65536 |
#define HASHTBLSIZE 65536 |
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| 59 |
stackitem *head; /* Head of the stack */ |
stackitem *head; /* Head of the stack */ |
| 60 |
hashtbl symbols; /* Hash table of all variable bindings */ |
hashtbl symbols; /* Hash table of all variable bindings */ |
| 61 |
int err; /* Error flag */ |
int err; /* Error flag */ |
| 62 |
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int non_eval_flag; |
| 63 |
} environment; |
} environment; |
| 64 |
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|
| 65 |
/* A type for pointers to external functions */ |
/* A type for pointers to external functions */ |
| 69 |
/* Initialize a newly created environment */ |
/* Initialize a newly created environment */ |
| 70 |
void init_env(environment *env) |
void init_env(environment *env) |
| 71 |
{ |
{ |
| 72 |
long i; |
int i; |
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|
| 74 |
env->err=0; |
env->err= 0; |
| 75 |
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env->non_eval_flag= 0; |
| 76 |
for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
| 77 |
env->symbols[i]= NULL; |
env->symbols[i]= NULL; |
| 78 |
} |
} |
| 80 |
/* Returns a pointer to a pointer to an element in the hash table. */ |
/* Returns a pointer to a pointer to an element in the hash table. */ |
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symbol **hash(hashtbl in_hashtbl, const char *in_string) |
symbol **hash(hashtbl in_hashtbl, const char *in_string) |
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{ |
{ |
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long i= 0; |
int i= 0; |
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unsigned long out_hash= 0; |
unsigned int out_hash= 0; |
| 85 |
char key= '\0'; |
char key= '\0'; |
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symbol **position; |
symbol **position; |
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| 305 |
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
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break; |
break; |
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case symb: |
case symb: |
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printf("'%s'", ((symbol *)(stack_head->item->content.ptr))->id); |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
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break; |
break; |
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case func: |
case func: |
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printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
printf("#<function %p>", (funcp)(stack_head->item->content.ptr)); |
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printf(" "); |
printf(" "); |
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stack_head=stack_head->next; |
stack_head=stack_head->next; |
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} |
} |
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printf("] "); |
printf("]"); |
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break; |
break; |
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default: |
default: |
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printf("#<unknown %p>", (stack_head->item->content.ptr)); |
printf("#<unknown %p>", (stack_head->item->content.ptr)); |
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nl(); |
nl(); |
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} |
} |
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/* Prints the stack. */ |
/* Prints the stack. */ |
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extern void printstack(environment *env) |
extern void printstack(environment *env) |
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{ |
{ |
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{ |
{ |
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stackitem *temp= env->head; |
stackitem *temp= env->head; |
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|
| 372 |
if((env->head)==NULL) { |
if(env->head==NULL || env->head->next==NULL) { |
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printerr("Too Few Arguments"); |
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env->err=1; |
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return; |
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} |
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if(env->head->next==NULL) { |
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printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
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env->err=1; |
env->err=1; |
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return; |
return; |
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env->head->next= temp; |
env->head->next= temp; |
| 381 |
} |
} |
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stackitem* copy(stackitem* in_item) |
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{ |
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stackitem *out_item= malloc(sizeof(stackitem)); |
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memcpy(out_item, in_item, sizeof(stackitem)); |
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out_item->next= NULL; |
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return out_item; |
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} |
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/* Recall a value from a symbol, if bound */ |
/* Recall a value from a symbol, if bound */ |
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extern void rcl(environment *env) |
extern void rcl(environment *env) |
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{ |
{ |
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push_val(&(env->head), val); /* Return its bound value */ |
push_val(&(env->head), val); /* Return its bound value */ |
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} |
} |
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void stack_read(environment*, char*); |
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/* If the top element is a symbol, determine if it's bound to a |
/* If the top element is a symbol, determine if it's bound to a |
| 414 |
function value, and if it is, toss the symbol and execute the |
function value, and if it is, toss the symbol and execute the |
| 415 |
function. */ |
function. */ |
| 416 |
extern void eval(environment *env) |
extern void eval(environment *env) |
| 417 |
{ |
{ |
| 418 |
funcp in_func; |
funcp in_func; |
| 419 |
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value* temp_val; |
| 420 |
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stackitem* iterator; |
| 421 |
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char* temp_string; |
| 422 |
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if(env->head==NULL) { |
if(env->head==NULL) { |
| 424 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
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env->err=1; |
env->err=1; |
| 426 |
return; |
return; |
| 427 |
} |
} |
| 428 |
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|
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/* if it's a symbol */ |
switch(env->head->item->type) { |
| 430 |
if(env->head->item->type==symb) { |
/* if it's a symbol */ |
| 431 |
|
case symb: |
| 432 |
rcl(env); /* get its contents */ |
rcl(env); /* get its contents */ |
| 433 |
if(env->err) return; |
if(env->err) return; |
| 434 |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
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eval(env); /* evaluate the value */ |
eval(env); /* evaluate the value */ |
| 436 |
return; |
return; |
| 437 |
} |
} |
| 438 |
} |
break; |
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|
|
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/* If it's a lone function value, run it */ |
/* If it's a lone function value, run it */ |
| 441 |
if(env->head->item->type==func) { |
case func: |
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in_func= (funcp)(env->head->item->content.ptr); |
in_func= (funcp)(env->head->item->content.ptr); |
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toss(env); |
toss(env); |
| 444 |
if(env->err) return; |
if(env->err) return; |
| 445 |
(*in_func)(env); |
(*in_func)(env); |
| 446 |
|
break; |
| 447 |
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| 448 |
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/* If it's a list */ |
| 449 |
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case list: |
| 450 |
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temp_val= env->head->item; |
| 451 |
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env->head->item->refcount++; |
| 452 |
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toss(env); |
| 453 |
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if(env->err) return; |
| 454 |
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iterator= (stackitem*)temp_val->content.ptr; |
| 455 |
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while(iterator!=NULL && iterator->item!=NULL) { |
| 456 |
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push_val(&(env->head), iterator->item); |
| 457 |
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if(env->head->item->type==symb |
| 458 |
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&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
| 459 |
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toss(env); |
| 460 |
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if(env->err) return; |
| 461 |
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eval(env); |
| 462 |
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if(env->err) return; |
| 463 |
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} |
| 464 |
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iterator= iterator->next; |
| 465 |
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} |
| 466 |
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free_val(temp_val); |
| 467 |
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break; |
| 468 |
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| 469 |
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/* If it's a string */ |
| 470 |
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case string: |
| 471 |
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temp_val= env->head->item; |
| 472 |
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env->head->item->refcount++; |
| 473 |
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toss(env); |
| 474 |
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if(env->err) return; |
| 475 |
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temp_string= malloc(strlen((char*)temp_val->content.ptr)+5); |
| 476 |
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strcat(temp_string, "[ "); |
| 477 |
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strcat(temp_string, (char*)temp_val->content.ptr); |
| 478 |
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strcat(temp_string, " ]"); |
| 479 |
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stack_read(env, temp_string); |
| 480 |
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eval(env); |
| 481 |
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if(env->err) return; |
| 482 |
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free_val(temp_val); |
| 483 |
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free(temp_string); |
| 484 |
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break; |
| 485 |
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| 486 |
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default: |
| 487 |
} |
} |
| 488 |
} |
} |
| 489 |
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|
| 490 |
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/* Reverse (flip) a list */ |
| 491 |
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extern void rev(environment *env){ |
| 492 |
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stackitem *old_head, *new_head, *item; |
| 493 |
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| 494 |
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if((env->head)==NULL) { |
| 495 |
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printerr("Too Few Arguments"); |
| 496 |
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env->err=1; |
| 497 |
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return; |
| 498 |
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} |
| 499 |
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|
| 500 |
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if(env->head->item->type!=list) { |
| 501 |
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printerr("Bad Argument Type"); |
| 502 |
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env->err=2; |
| 503 |
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return; |
| 504 |
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} |
| 505 |
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| 506 |
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old_head=(stackitem *)(env->head->item->content.ptr); |
| 507 |
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new_head=NULL; |
| 508 |
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while(old_head != NULL){ |
| 509 |
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item=old_head; |
| 510 |
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old_head=old_head->next; |
| 511 |
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item->next=new_head; |
| 512 |
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new_head=item; |
| 513 |
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} |
| 514 |
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env->head->item->content.ptr=new_head; |
| 515 |
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} |
| 516 |
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|
| 517 |
/* Make a list. */ |
/* Make a list. */ |
| 518 |
extern void pack(environment *env) |
extern void pack(environment *env) |
| 519 |
{ |
{ |
| 554 |
temp->item= pack; |
temp->item= pack; |
| 555 |
|
|
| 556 |
push(&(env->head), temp); |
push(&(env->head), temp); |
| 557 |
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rev(env); |
| 558 |
} |
} |
| 559 |
|
|
| 560 |
/* Parse input. */ |
/* Parse input. */ |
| 564 |
int itemp; |
int itemp; |
| 565 |
size_t inlength= strlen(in_line)+1; |
size_t inlength= strlen(in_line)+1; |
| 566 |
int convert= 0; |
int convert= 0; |
|
static int non_eval_flag= 0; |
|
| 567 |
|
|
| 568 |
temp= malloc(inlength); |
temp= malloc(inlength); |
| 569 |
rest= malloc(inlength); |
rest= malloc(inlength); |
| 570 |
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|
| 571 |
do { |
do { |
| 572 |
|
/* If comment */ |
| 573 |
|
if((convert= sscanf(in_line, "#%[^\n\r]", rest))) { |
| 574 |
|
free(temp); free(rest); |
| 575 |
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return; |
| 576 |
|
} |
| 577 |
|
|
| 578 |
/* If string */ |
/* If string */ |
| 579 |
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) { |
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) { |
| 580 |
push_cstring(&(env->head), temp); |
push_cstring(&(env->head), temp); |
| 599 |
/* If single char */ |
/* If single char */ |
| 600 |
if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) { |
if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) { |
| 601 |
if(*temp==';') { |
if(*temp==';') { |
| 602 |
if(!non_eval_flag) { |
if(!env->non_eval_flag) { |
| 603 |
eval(env); /* Evaluate top element */ |
eval(env); /* Evaluate top element */ |
| 604 |
break; |
break; |
| 605 |
} |
} |
| 611 |
if(*temp==']') { |
if(*temp==']') { |
| 612 |
push_sym(env, "["); |
push_sym(env, "["); |
| 613 |
pack(env); |
pack(env); |
| 614 |
if(non_eval_flag!=0) |
if(env->non_eval_flag) |
| 615 |
non_eval_flag--; |
env->non_eval_flag--; |
| 616 |
break; |
break; |
| 617 |
} |
} |
| 618 |
|
|
| 619 |
if(*temp=='[') { |
if(*temp=='[') { |
| 620 |
push_sym(env, "["); |
push_sym(env, "["); |
| 621 |
non_eval_flag++; |
env->non_eval_flag++; |
| 622 |
break; |
break; |
| 623 |
} |
} |
| 624 |
} |
} |
| 653 |
return; |
return; |
| 654 |
} |
} |
| 655 |
|
|
| 656 |
|
rev(env); |
| 657 |
|
|
| 658 |
|
if(env->err) |
| 659 |
|
return; |
| 660 |
|
|
| 661 |
/* The first list element is the new stack head */ |
/* The first list element is the new stack head */ |
| 662 |
new_head= temp= env->head->item->content.ptr; |
new_head= temp= env->head->item->content.ptr; |
| 663 |
|
|
| 840 |
} |
} |
| 841 |
printf("okidok\n "); |
printf("okidok\n "); |
| 842 |
} |
} |
| 843 |
|
quit(&myenv); |
| 844 |
exit(EXIT_SUCCESS); |
return EXIT_FAILURE; |
| 845 |
} |
} |